*{box-sizing:border-box}
.pdf-course-body{--accent:#3d76e8;--accent2:#2459c4;margin:0;font-family:"PingFang SC","Microsoft YaHei",Arial,sans-serif;color:#173b78;background:linear-gradient(180deg,#f1f6ff,#fff);min-height:100vh}
.pdf-hero{padding:28px 20px 70px;background:linear-gradient(135deg,var(--accent2),var(--accent));color:#fff;border-radius:0 0 38px 38px}.pdf-inner,.pdf-shell{width:min(1120px,calc(100% - 32px));margin:auto}.pdf-top{display:flex;gap:10px;flex-wrap:wrap}.pdf-pill{display:inline-flex;align-items:center;color:#fff!important;text-decoration:none;padding:9px 15px;border:1px solid #ffffff70;border-radius:999px;background:#ffffff12;font-weight:700}.pdf-hero h1{font-size:clamp(34px,6vw,58px);margin:28px 0 8px}.pdf-hero p{margin:0;color:rgba(255,255,255,.9);line-height:1.7}.pdf-shell{margin-top:-36px;padding-bottom:30px}.pdf-panel{background:#fff;border:1px solid #e3ecff;border-radius:24px;box-shadow:0 16px 45px rgba(39,81,142,.10);padding:22px;margin-bottom:18px}.pdf-chapter-nav{display:grid;grid-template-columns:1fr auto 1fr;gap:10px;align-items:center}.pdf-chapter-nav a,.pdf-chapter-nav span{min-height:44px;display:flex;align-items:center}.pdf-chapter-nav a{text-decoration:none;color:var(--accent2);font-weight:800}.pdf-chapter-nav .next{justify-content:flex-end}.pdf-chapter-nav .center{justify-content:center;color:#6f7f9a;font-weight:800;text-align:center}.pdf-chapter-nav .disabled{opacity:.35}.pdf-toolbar{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:14px}.pdf-toolbar strong{font-size:17px}.pdf-open{display:inline-flex;padding:9px 14px;border-radius:12px;background:var(--accent);color:#fff!important;text-decoration:none;font-weight:800}.pdf-frame{display:block;width:100%;height:min(78vh,920px);border:1px solid #d9e5f8;border-radius:16px;background:#eef3fb}.pdf-hint{font-size:12px;color:#71829d;margin:10px 0 0}.pdf-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.pdf-card{position:relative;display:flex;align-items:center;gap:14px;padding:18px;border:1px solid #e1e9f8;border-radius:18px;text-decoration:none;color:#173b78;background:linear-gradient(135deg,#fff,#f6f8ff);transition:.2s;min-height:92px}.pdf-card:hover{transform:translateY(-3px);box-shadow:0 12px 28px rgba(35,70,130,.13)}.pdf-num{flex:0 0 48px;width:48px;height:48px;border-radius:15px;display:grid;place-items:center;background:color-mix(in srgb,var(--accent) 14%,white);color:var(--accent2);font-weight:900}.pdf-info{min-width:0}.pdf-info strong{display:block;font-size:16px}.pdf-info small{display:block;margin-top:5px;color:#71829d;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.pdf-arrow{margin-left:auto;font-size:26px;color:var(--accent)}.pdf-search{width:100%;border:1px solid #dbe6f7;border-radius:14px;padding:12px 14px;font:inherit;outline:none}.pdf-search:focus{border-color:var(--accent);box-shadow:0 0 0 3px color-mix(in srgb,var(--accent) 15%,transparent)}.pdf-module-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.pdf-module{--module:#4078ee;position:relative;display:block;min-height:210px;padding:26px;border-radius:24px;text-decoration:none;color:#173b78;background:linear-gradient(135deg,#fff,#f4f7ff);border:1px solid #e1e8f7;overflow:hidden;box-shadow:0 12px 30px rgba(35,70,130,.09);transition:.2s}.pdf-module:hover{transform:translateY(-4px)}.pdf-module .tag{position:absolute;right:18px;top:17px;border-radius:999px;background:var(--module);color:#fff;padding:6px 12px;font-weight:800}.pdf-module .icon{font-size:40px}.pdf-module h2{max-width:80%;font-size:26px;line-height:1.35;margin:14px 0 7px}.pdf-module p{color:#71829d}.pdf-module .go{position:absolute;left:26px;bottom:20px;font-size:30px;color:var(--module)}
@media(max-width:720px){.pdf-grid,.pdf-module-grid{grid-template-columns:1fr}.pdf-frame{height:72vh}.pdf-chapter-nav{grid-template-columns:1fr 1fr}.pdf-chapter-nav .center{grid-column:1/-1;grid-row:1}.pdf-chapter-nav .next{justify-content:flex-end}.pdf-panel{padding:16px}.pdf-hero{padding-left:16px;padding-right:16px}.pdf-shell{width:min(100% - 20px,1120px)}}